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How to count a consecutive series of positive or negative values in a column in python

a = [0,0,1,1,1,0,0,1,0,1,1]
b = [0,0,0,0,0,0,0,0,0,0,0]

for i in range(len(a)):
    if a[i] == 1:
        b[i] = b[i-1] + 1
    else:
        b[i] = 0
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